Why does neutron capture work?
A) Neutrons have no repulsive barrier to overcome in combining with positively charged nuclei.
B) Neutrinos, because of their low mass and high speed, easily penetrate nuclei.
C) Single protons have little repulsion to heavy nuclei and easily fuse with them.
D) Photodisintegration makes many alpha particles, available for capture by nuclei.
E) Neutronization captures all the protons and electrons.
Question 2
The most accurate Greek attempt to explain planetary motion was the model of:
A) Aristotle.
B) Pythagoras.
C) Hipparchus.
D) Ptolemy.
E) Erastothenes.
Pulsars are highly magnetized, rotating neutron stars that emit a beam of electromagnetic radiation.
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